4212   astronomy
     4251   moon
     4284   sun
     4812   darkness, God's judgment

Joel 2:28-32

     1429   prophecy, OT fulfilment
     2424   gospel, promises
     7408   Pentecost
     8145   renewal, people of God
     9140   last days

Joel 2:29-32

     4035   abundance

Joel 2:30-31

     1450   signs, kinds of
     4028   world, redeemed
     7318   blood, symbol of guilt

Joel 2:30-32

     4810   darkness, natural
     9220   day of the LORD